Did covid-19 come from a lab leak in China?

Why is the laboratory leak theory in the news again?As a mystery with no definitive answer, the story of the origin of covid-19 has almost never left media reports or the public consciousness in the three years since the pandemic began.Most recently, the US government declassified documents1 relating to its investigation into the origins of covid-19,2 while the Sunday Times reported documents and an interview with a former US government source.3 The Wall Street Journal also reported that three researchers who had been conducting coronavirus research at a controversial Wuhan laboratory in China (see box 1) were allegedly sick with signs of a respiratory illness at the end of 2019. And a BBC podcast about covid’s possible beginnings4 featured rare public comments from the former head of China’s infectious disease agency.Box 1What is the laboratory leak theory of covid-19?This is the theory that instead of coming from a naturally occurring…
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